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To precisely measure radon concentrations in purified air supplied to the Super-Kamiokande detector as a buffer gas, we have developed a highly sensitive radon detector with an intrinsic background as low as 0 . 33 ± 0 . 07 mBq ∕ m 3 . In this article, we discuss the construction and calibration of this detector as well as results of its application to the measurement and monitoring of the...
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